Bash Script Flags

Can you explain me common UNIX / Linux / Mac OS X / BSD bash shell script flags?

You can pass -v and -x option to #!/bin/sh or #!/bin/bash:


  1. The -v option displays each command before executing it. This is the equivalent of inserting set -v in the script.
  2. The -x option displays the result each command. This is the equivalent of inserting set -x in the script.

Above flags are useful for debugging shell problems:

#!/bin/sh -x
echo "This is a test"
[ ! -f $FILE ] || echo "File $FILE does not exist"

You can run them from command prompt itself:

sh -x /path/to/script
bash -xv /path/to/script
sh -nv /path/to/script

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